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है”ह”ह

IS 2051 (1976): Method for Sampling of Leather Footwear[CHD 19: Footwear]

IS : 2051- 1976

Gr 3

Indian Standard

METHOD FOR

SAMPLING OF LEATHER FOOTWEAR

( First Reuision )

Second Reprint May 1997

UDC 685.312[675.06]:620.113

@ Copyright 1976

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHt 110002

August 1976

I

IS:2051-1976

Indian Standard

METHOD FOR

SAMPLING OF LEATHER FOOTWEAR

( First Retiision )

Footwear Sectional Committee, CDC 40

Chairman

SHRI N. R. LODH

Representing

Development Commissioner, Small Scale Industries, New Delhi

Members

SHRI B. P. A~ARWAL Directorate of Industries, Government of Uttar Pradesh, Kanpur

SHRI K. S. UNNY ( Alternate ) SHRI P. L. BANERIEE Glace Kid ( India ) Pvt Ltd, Calcutta SHRI A. T. BASAK Directorate General of Supplies & Disposals,

New Delhi SHRI P. F. MILLER ( Alternate )

SHRI SUNIL KUMAR BHADRA Bata India Ltd, Calcutta SHRI GOPAL LAL GHOSH Indian Leather Technologists’ Association, Calcutta

SHRI B. D. SEN GUPTA ( AIternate ) SHR~ N. KANNAN Ministry of Defence ( R & D ) SHRI M. S. KOHLI Leather Linkers, Agra MANAGING DIRECTOR, T A M I L Department of Industries & Commerce, Government

N A D u SMALL INDUSTRIES of Tamil Nadu, Madras CORPORATION

SHRI P. G. MENON Madura Coats Ltd, Madurai SHRI K. K. VERMA ( Alternate )

SHRJ ASHOK MUBAYI Department of Civil Supplies and Cooperation ( Ministry of Industry & Civil Supplies )

SHRJ V. K. MURTHY Standing Committee on Safety for the Steel Industry, Durgapur

SHRI D. M. DHAR ( Afternate ) SHRJ S. M. PATHARKAR Swastik Rubber Products Ltd, Pune

SHRI N. J. TALWAR ( Afternate ) SHRJ S. S.. PRASAD Directorate General of Mines Safety, Dhanbad

SHRI A. C. SRIVASTAVA ( Alternate ) DR N. RAMANATHAN Central Leather Research Institute (CSIR), Madras SHRI S. R. C. RAO Hindustan Steel Ltd, Ranchi

SHRJ A. K. DAS GUPTA ( AIternate )

(Continued on page 2 )

Q Copyrkht 1976 BUREAU OF INDIAN STANDARDS

This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the uublisher shall be deemed to be an infrinkement of copyright under the said Act.

IS:2051-1976

( Continued from page 1 )

Members Representing

SHRI R. S. ROY Bengal Waterproof Works (1940) Ltd, Calcutta SHRI B. DUTTA ( Alternate )

SHRI G. ROY CHOUDHURY Export Promotion Council for Finished Leather and Leather Manufactures. Kanuur _

SHRI JANE ALAM ( Alternate ) SHRI K. C. SAHA Central Footwear Training Centre, Madras SHRI S. R. SAHA Ministry of Defence ( DGI )

SHRI W. G. EDGAR ( Alternate ) SHRI A. K. SEN State Trading Corporation of India Ltd, New Delhi SHRI N. R. SIKDAR Commerce and Industries Department, Government

of West Bengal, Calcutta SHRI R. N. BISWAS ( Alternate )

SHRI SUBHAS SINHA Aero Traders, New Delhi SHRI MAN MOHAN SINGH ( Alternate )

SHR~ J. SINHA ROY Tannerern;.rd Footwear Corporation of India Ltd,

SHRI D. N. SINHA ( Alternate ) SHRI R. THANJAN Directorate General of Technical Development,

New Delhi P -?I R. S. GHOSH ( Alternate )

DR G. &I. SAXENA, Director General, ISI ( Ex-officio Member ) Director ( Chem )

Secretary

SHRI S. DAS GUPTA Assistant Director ( Chem ), ISI

Measurement, Sampling and Testing Subcommittee, CDC 40 : 2

Convener

SHRI N. R. LODH Development Commissioner, Small Scale Industries, New Delhi

Members

SHRI S. K. BHADRA Bata India Ltd, Calcutta SHRI AJOY Bose Bengal Waterproof Works ( 1940) Ltd, Calcutta

SHRI B. DUTTA ( Alternate ) SHRI S. K. MITRA Central Leather Research Institute (CSIR ), Madras PRINCIPAL College of Leather Technology, Calcutta SHRI K. C. SAHA Central Footwear Training Centre, Madras SHRI S. R. SAHA Ministry of Defence ( DGI )

SHRI W. G. EDGAR ( AIternate ) SHRI B. P. SEN GUPTA Directorate General of Supplies & Disposals,

New Delhi

( Continued on page 10 )

2

IS:2051-1976

Indian Standard

METHOD FOR

SAMPLING OF LEATHER FOOTWEAR

( First Reuision )

0. FOREWORD

0.1 This Indian Standard ( First Revision ) was adopted by the Indian Standards Institution on 14 June 1976, after the draft finalized by the Footwear Sectional Committee had been approved by the Chemical Division Council.

0.2 In the supply of footwear produced to a relevant specification, an important problem that usually arises is to check the quality of the material supplied and to determine its acceptability or otherwise. For checking the quality on the basis of the sampling inspection, a suitable procedure has to be prescribed for drawing the representative samples of footwear items and properly interpreting the results of inspection.

0.3 This standard was originally published in 1962 which laid down the methods for sampling as also the criteria for ascertaining the conformity of a supply to the relevant specification. The sampling procedure as laid down in this revision is specifically intended for the inspection of finished footwear and includes permissible number of defectives of footwear for major and minor defects for visual and tactile characteristics. The ma.jor and minor defects have been listed in Appendix A. The number of sample pairs for physical tests have also been included in Table 1. However, for controlling the quality of footwear at various stages of production, use of statistical quality control methods is recommended for which reference may be made to the following Indian Standards:

IS:397 (Part I )-1972 Method for statistical quality control duri, production: Part I Control charts for variables ( jirst revision )

IS:397 (Part II)-1975 Method for statistical quality control during production: Part II Control charts for attributes and count of defects ( first revision )

0.4 This standard is a necessary adjunct to Indian Standard specifications on leather footwear.

3

IS : 2051- 1976

1. SCOPE

1.1 This standard prescribes the method of sampling and the criteria for conformity for leather footwear.

1.2 This standard does not include the sampling procedure for canvas or rubber footwear.

2. TERMINOLOGY

2.0 For the purpose of this standard, the definitions given in IS: 2050-1967’ and the following shall apply.

2.1 Tender Sample - The pairs of leather footwear of any particular size and pattern submitted by the supplier with his tender.

2.2 Approved Sample-The pairs of footwear of any particular size, fitting and pattern chosen from the tender samples by the purchaser as the basis for supply. When a sample is tested and approved by the purchaser, the results of such tests that would help the supplier in meeting the specification for deliveries shall be made available to the supplier on request.

2.3 Defect - A failing or fault; a failure of a footwear to meet the require- ment of a specification or approved sample, if any, with respect to any quality characteristics; also an irregularity in material, workmanship, etc.

2.4 Defective Footwear - A footwear which has one or more defects with respect to the quality characteristics under consideration.

2.5 Acceptable Quality Level ( AQL) - The maximum percent defectives that for purpose of sampling of leather footwear can be considered as satisfactory process average for a given characteristic.

NOTE - For every sampling pla?, there is an associated AQL value and this value is given as percent defective items m a lot which under the plan will be accepted by the purchaser most of the times.

3. SCALE OF SAMPLING

3.1 Lot - All footwear pairs in a consignment belonging to the same size, pattern, and batch of manufacture shall constitute a lot. In case the consignment is not so covered, the footwear pairs belonging to the same size or to a set of sizes and in a given proportion for each size, pattern and batch of manufacture shall be classed together and each such group shall constitute a lot.

*Glossary of footwear terms.

4

IS : 2051-1976

3.1.1 For the purpose of this standard, footwear shall be considered to be of different patterns if they differ in any of the ways enumerated below or in any other way which is liable to affect any of the test results:

a) b) cl

d) e)

Method of preparation;

Steel toe caps, toe puffs or other reinforcements;

Type or thickness of upper and bottom materials (for example, outer toe-cap, lining, insole, through-sole or outersole );

Nailing or other reinforcement of sole; and

Shape of last.

3.2 Samples shall be selected and examined for each lot separately for ascertaining the conformity of the footwear to the requirements of the specification under consideration.

3.3 The number of footwear pairs to be selected from any lot shall depend on the size of the lot ( that is, the number of footwear pairs in the lot ), and shall be in accordance with co1 1 and 2 of Table 1.

4. METHOD FOR SELECTING FOOTWEAR

4.1 Footwear pairs to be selected from the lot ( see 3.3 ) shall be chosen at random. In order to ensure the randomness of selection, a random number table shall be followed. For necessary guidance to the use of random number table, IS : 49051965* may be referred.

4.2 In case a random number table is not available, the footwear pairs may be selected from the lot in the following manner:

Starting from any footwear pair in the lot, the pairs shall be counted as 1, 2, etc ,...... up to r and so on, in one order. Every rth pair thus counted shall be withdrawn to constitute the sample, where r is the integral part of N/n ( N and n being the lot size and sample size, respectively ). This procedure may be stopped as soon as the required number of pairs is obtained.

4.2.1 For example, if a sample of 450 pairs is to be selected from a lot of 3 000 pairs, compute r as equal to integral part of 3 000/450 ( = 6.7 ) which is 6. Starting from any pair, the footwear shall be counted in one order and every sixth pair shall be withdrawn. -

4.3 When the footwear pairs in a lot are packed in different boxes, a suitable number of boxes ( not less than 30 percent of the total in the lot ) shall be first chosen at random. From each of the boxes so chosen, an approximately equal number of pairs shall be picked up from its different parts so as to obtain the required number of pairs.

*Methods for random sampling.

5

Y

TABLE 1 SCALE OF SAMPLING AND PERMISSIBLE NUMBER OF DEFECTIVES

(Cfauses3.3,5.1.1,5.1.2,5.2.1,5.3.1 und5.3.2)

No. OF FOOTWEAR PAIRS IN THE

LoT (N)

(1)

up to 50

51 ,, 100 o\

101 ,, 300

301 ,, 500

501 ,, 800

801 ,, 1300

1301 ,, 3200

3 201 and above

VISUAL AND TACTILE CHARACTERISTICS DIMENSIONAL r-- -I- \ CHARACTERISTICS

Sample Permissible No. Permissible No. r--h- Pairs (n) of Defectives of Defectives Sample Permissible

fo,reE;j; fo;eyzt;r Pairs No. of Defectives

(2) (3) (41 (5) (6)

All * * 5 0

50 1 4 8 1

75 2 6 13 1

150 4 11 20 1

225 5 17 32 2

300 7 20 50 3

450 10 29 80 5

750 15 45 125 7

DESTRUCTIVE TESTS FOR PHYSICAL

CHARACTERISTICS, SAMPLE PAIRS

(7)

1

2

3

3

NOTE - Classification of major and minor defects is given in Appendix A.

*As agreed to between the purchaser and the supplier.

. . . .

IS: 2051.1976

4.3.1 For example, if a lot consists of 1200 pairs of footwear packed in 50 boxes each containing 24 pairs, not less than 15 boxes shall be chosen. If it is decided to open 20 boxes, then 15 pairs shall be picked up from different parts of each of the 20 boxes, so as to give a total of 300 pairs as specified against the lot of 1 200 in Table 1.

5. CRITERIA FOR CONFORMITY

5.1 Visual and Tactile Characteristics-All the pairs under 3.3 shall be first examined for visual and tactile characteristics. The defects observed on such examination have been broadly divided into two classes namely, major defects and minor defects and have been listed in Appendix A.

5.1.1 The footwear pairs selected under co1 2 of Table 1 shall be examined for major defects ( see Appendix A ). A footwear with one or more defects shall be considered as defective. A pair of footwear shall be termed as defective if one or both of the constituent footwears are found defective. If the number of defective footwears is less than or equal to the corresponding permissible number of defectives given in co1 3 of Table 1, the lot shall be considered to have satisfied the requirements of visual and tactile characteristics for major defects.

5.1.2 A lot which has been found satisfactory under 5.1.1 shall be examined for minor defects ( see Appendix A ). The lot shall be deemed to have satisfied the requirements for visual and tactile characteristics ( for minor defects ) if the number of defective pairs does not exceed the corresponding, permissible number of defectives given in co1 4 of Table 1.

5.1.3 The lot shall be declared to conform to the requirements for visual and tactile characteristics if 5.1.1 and 5.1.2 are satisfied. If however, the number of defective pairs exceeds the permissible number, the lot shall be deemed as not conforming to the requirements for these characteristics.

5.1.4 In case of those lots which have been found unsatisfactory for visual and tactile characteristics, all footwear pairs in the lot may be inspected and defective ones replaced.

5.2 Dimensional Characteristics - The lot which has been found satis- factory as in 5.1 shall next be tested for dimensional characteristics without opening up of the footwear.

5.2.1 The pairs for this purpose shall be taken from those already drawn ( see 3.3 ) in accordance with co1 2 and 5 of Table 1. These pairs shall be taken at random and tested for dimensional characteristics as specified in the relevant specification. If the number of pairs failing to satisfy the requirements for these characteristics is less than or equal to the corres- ponding number given in co1 6 of Table 1, the lot shall be declared to have met the requirements for these characteristics, otherwise not.

7

IS:2051-1976

5.3 Destructive Tests

5.3.1 Physical Characteristics - The lot having been found satisfactory for dimensional characteristics ( see 5.2) shall be next tested for physical characteristics given in the relevant specification. For this purpose the pairs shall be selected at random from those already tested ( see 5.2.1 ) in accordance with co1 5 and 7 of Table 1. These pairs shall be opened up and subjected to physical tests specified in the relevant specification. The lot shall be declared as satisfactory in respect of these characteristics if all the sample pairs under co1 7 of Table 1 pass the prescribed tests.

5.3.2 Chemical and Dimensional Characteristics of the Components - The lot which has been found satisfactory for the characteristics given in 5.1, 5.2 and 5.3.1 shall be finally tested for chemical properties and dimensional characteristics of the components by opening up of the footwear. For this purpose, two pairs shall be drawn from each lot at random from those already tested and found satisfactory in accordance with co1 5 and 6 of Table 1. These two pairs shall then be opened up and tested for chemical and dimensional characteristics of the components as specified in the relevant footwear specification. The lot shall be declared to have satisfied the requirements for these characteristics if both the sample pairs are found satisfactory.

NOTE - For chemical analysis, the test samples may be prepared by mixing the cuttings from both the units in a pair.

5.4 The lot shall be deemed as conforming to the relevant specification if it satisfies the requirements of the visual, tactile, dimensional, physical and chemical characteristics as given in 5.1 to 5.3.

APPENDIX A

( Cfuuses 5.1, 5.1.1 and 5.1.2 )

CLASSIFICATION OF DEFECTS OF LEATHER FOOTWEAR

a) Major Defects

Sl No.

i) Last

ii) (Upper { Lining I-Bottom

Shape; measurement girth; instep; length; toespring; height of heel

Firmness; dry; loose; crack; spotted Colour not fast Heel tips

8

IS : 2051- 1976

Sl No.

iii) Closing and stamping

iv) Lasting, toe-puff, and weft stitching

v) Sole stitching trimm- ing

b) Minor Defects

Sl No.

i) I- Upper ( Lining [Bottom

ii) Closing and stamping

iii) Lasting, toe-puff and weft stitching

iv) Sole stitching trimm- ing

v> Finishing

Folding; position of stitches; quality of stitches; back strap; stitching

Stiffener inserting; toe puff inserting; pulling over weft stitching

Sole stitching; heel lift attachment; french curve pasting

Vein marks Shade; folded; creased Loose

Stamping; back seam; perforation; decoration; eyeletting

Side lasting; toe lasting; shanking; filling

Sole channelling; top lift attachment; heel tip attachment; heel breasting; heel trimming; heel scouring; edge trimming; edge setting

Upper dressing; bottom finishing; bottom colouring

9

IS:2051-1976

( Confinued from page 2 )

Panel to Study the Sampling Procedures with Different Acceptable Quality Levels for Small Scale and Large Scale

Manufacturers of Footwear, CDC 40 : 2 : 1

Convener Representing

DR B. N. SINGH Indian Standards Institution, New Delhi

Members SHRI 0. P. DHAMIJA Export Inspection Council, Calcutta

SHRI S. J. PANDE ( Alternate ) SHRI N. R. LODH Development Commissioner, Small Scale Industries,

New Delhi SHRI S. R. SAHA Ministry of Defence (DGI )

SHRI W. G. EDGAR ( Alternate )

10

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Telephone

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271085

3096528

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222 39 71

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